* {
  padding: 0;
  margin: 0;
  list-style: none;
  box-sizing: border-box;
}
.ltk {
  width: 100vw;
  height: 90vh;
  overflow-y: auto;
}
.tj {
  width: 10vw;
  height: 8vh;
  color: #ffe457;
  background: #3087ea;
  bottom: 50px;
  left: 170px;
  position: fixed;
  font-size: 30px;
  display: flex;
  border-radius: 50%;
  padding: 10px 2px;
}
